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Publications
Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
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Daniel, G.; Renard, F.; Thouvenot, F.; Jenatton, L.; Helmstetter, A.; Hainzl, S.; Marsan, D.; Guiguet, R. (2011): Changes in effective stress during the 2003-2004 Ubaye seismic swarm, France. Journal of Geophysical Research, 116, B01309.
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Semmling, A. M.; Beyerle, G.; Stosius, R.; Dick, G.; Wickert, J.; Fabra, F.; Cardellach, E.; Ribó, S.; Rius, A.; Helm, A.; Yudanov, S. B.; d'Addio, S. (2011): Detection of Arctic Ocean tides using interferometric GNSS-R signals. Geophysical Research Letters, 38, L04103.
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Kaiser, K.; Miehe, G.; Barthelmes, A.; Ehrmann, O.; Scharf, A.; Schult, M.; Schlütz, F.; Adamczyk, S.; Frenzel, B. (2008): Turf-bearing topsoils on the central Tibetan Plateau, China: Pedology, botany, geochronology. Catena, 73, 3, 300-311.
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Mayer, C.; Lambrecht, A.; Hagg, W.; Helm, A.; Scharrer, K. (2008): Post-drainage ice dam response at Lake Merzbacher, Inylchek glacier, Kyrgyzstan. Geografiska Annaler, Series A: Physical Geography, 90, 1, 87-96.
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Kaiser, K.; Barthelmes, A.; Czakó Pap, S.; Hilgers, A.; Janke, W.; Kühn, P.; Theuerkauf, M. (2006): A Lateglacial palaeosol cover in the Altdarss area, southern Baltic Sea coast (Northeast Germany): investigations on pedology, geochronology and botany. Netherlands Journal of Geosciences, 85, 3, 197-220.
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Larter, S. R.; Wilhelms, A.; Head, I. M.; Koopmans, M.; Aplin, A. C.; di Primio, R.; Zwach, C.; Erdmann, M.; Telnaes, N. (2003): The controls on the composition of biodegraded oils in the deep subsurface––part 1: biodegradation rates in petroleum reservoirs.. Organic Geochemistry, 34, 4, 601-613.
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Helm, A.; Braun, A.; Eickschen, S.; Schöne, T. (2002): Calibration of the shuttle radar topography mission X-SAR instrument using a synthetic altimetry data model. Canadian Journal of Remote Sensing, 28, 4, 573-580.
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Montenbruck, O.; Markgraf, M.; Garcia-Fernandez, M.; Helm, A. (2008): GPS for Microsatellites – Status and Perspectives. - In: Sandau, R.; Röser, H. P.; Valenzuela, A. (Eds.), Small Satellites for Earth Observation : selected contributions; [proceedings of the 6th International Symposium of the International Academy of Astronautics], Springer, 165-174.
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Dransch, D.; Krawczyk, C.; Helm, A. (2007): Visualisierung – eine leistungsfähige Methode für den geowissenschaftlichen Forschungsprozess. Thematische Kartierungen in den Geowissenschaften = Thematic Mapping in Geosciences, Dt. Akad. der Naturforscher Leopoldina, 151-164.
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Helm, A.; Wetzel, H.-U.; Michajljow, W.; Beyerle, G.; Reigber, C.; Rothacher, M. (2007): Natural Hazard Monitoring with reflected GPS signals at Merzbacher Glacier Lake. - In: Seyfert, E. (Eds.), Vorträge Dreiländertagung SGPBF, DGPF und OVG : 27. wissenschaftlich-technische Jahrestagung der DGPF, 19. - 21. Juni 2007 in Muttenz, Basel, DGPF, 505-516.
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Wickert, J.; Gendt, G.; Beyerle, G.; Heise, S.; Helm, A.; Reigber, C.; Schmidt, T.; Jakowski, N.; Jacobi, C. (2007): Ground and Space Based GPS Atmospheric Sounding: Brief Overview and Examples. - In: Anandan, V. K.; Roettger, J.; Rao, D. N. (Eds.), Proceedings of the INTAR colloquium -International Network of Atmosphere Radar-, National Atmospheric Research Laboratory, Gadanki, 1-10.
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Helm, A.; Beyerle, G.; Heise, S.; Schmidt, T.; Wickert, J. (2005): The continuous Wavelet Transform, a valuable analysis tool to detect atmospheric and ionospheric signatures in radiooccultation path delay data. - In: Reigber, C.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth Observation with CHAMP - Results from Three Years in Orbit, Springer, 591-596.
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Larter, S. R.; Head, I. M.; Huang, H.; Bennett, B.; Jones, M.; Aplin, A. C.; Murray, A.; Erdmann, M.; Wilhelms, A.; di Primio, R. (2005): Biodegradation, gas destruction and methane generation in deep subsurface petroleum reservoirs: an overview.. - In: Doré, A. G.; Vining, B. A. (Eds.), Petroleum Geology: North-West Europe and Global Perspectives - Proceedings of the 6th Petroleum Geology Conference, Geological Society, 1-1690.
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Semmling, M.; Beyerle, G.; Stosius, R.; Wickert, J.; Fabra, F.; Cardellach, E.; Rib´o, S.; Rius, A.; Helm, A.; Yudanov, S.; d’Addio, S. (2010): Reflected GPS L1/L2 observations used for Sea Ice remote sensing and altimetry. AGU 2010 Fall Meeting (San Francisco, USA 2010).
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Stosius, R.; Beyerle, G.; Semmling, M.; Helm, A.; Hoechner, A.; Wickert, J.; Lauterjung, J. (2010): Tsunami detection from space using GNSS reflections: results and activities from GFZ. Proceedings, 30th anniversary IGARSS - IEEE International Geoscience and Remote Sensing Symposium (Honolulu, HI, USA 2010), 3047-3050.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Chen, J.; Dick, G.; Ge, M.; Heise, S.; Helm, A.; Rothacher, M.; Ramatschi, M.; Schmidt, T.; Stosius, R. (2009): GNSS atmosphere sounding at GFZ : Overview and recent results. International Technical Meeting on GNSS ( (ITM-GNSS) (Beijing 2009).
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Wickert, J.; Arras, C.; Brieß, K.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Herfort, M.; Heise, S.; Köhler, W.; Massmann, F. H.; Michalak, G.; Schmidt, T.; Stosius, R. (2009): GPS radio occultation at GFZ: Recent activities and plans. International Workshop GPS Radio Occultation, NASA/JPL (Pasadena 2009).
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Helm, A.; Beyerle, G.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Nitschke, M.; Gruber, T.; Hess, M. P.; Wickert, J.; Rothacher, M. (2008): GNSS Reflectometry at GFZ. Workshop on 'ACES and Future GNSS-based Earth Observation and Navigation' (München 2008).
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Helm, A.; Beyerle, G.; Stosius, R.; Rothacher, M. (2008): Using reflected Global Navigation Satellite System signals for remote sensing: Some overview. CEOS WGCV Microwave Sensors Sub-group Meeting (Noordwijk 2008).
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Helm, A.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Renaudie, C.; Bender, M.; Dick, G.; Beyerle, G.; Wickert, J.; Rothacher, M. (2008): GNSS-R carrier phase altimetry with GPS L2C signals and status of the GORS and GORS follow-on space receiver prototypes. GNSS-R’08 Workshop on GNSS Reflectometry (Noordwijk 2008).
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Helm, A.; Wetzel, H.-U.; Falck, C.; Michajljow, W.; Bens, O.; Mayer, C.; Lambrecht, A.; Hagg, W.; Dudashvili, A.; Rothacher, M. (2008): The 2005 Lake Merzbacher GLOF event and status of future planned activities in the Tien Shan region. General Assembly European Geosciences Union (Vienna, Austria 2008).
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Helm, A.; Wetzel, H.-U.; Michajljow, W.; Mayer, C.; Lambrecht, A.; Hagg, W.; Dudashvili, A.; Beyerle, G.; Rothacher, M. (2008): Using Reflected GPS Signals for the Observation of the Second 2005 Lake Merzbacher GLOF Event. International Workshop 'Glacial Lake Outburst Floods in Central Asia - GLOF' (Bishkek, Kyrgyzstan 2008).
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Svehla, D.; Rothacher, M.; Salomon, C.; Beyerle, G.; Wickert, J.; Helm, A.; Ziebart, M.; Dow, J.; Cacciapuoti, L. (2008): Galileo on board International Space Station and combination with the ACES Mission. 22nd European Frequency and Time Forum (Toulouse, France 2008).
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Svehla, D.; Rothacher, M.; Salomon, C.; Beyerle, G.; Wickert, J.; Helm, A.; Ziebart, M.; Dow, J.; Cacciapuoti, L.; Börner, T.; Montenbruck, O.; Rivas, R.; Rius, A.; Cardellach, E.; Gruber, T. (2008): GALILEO on board the International Space Station, the last 5 years. GNSS-R’08 Workshop on GNSS Reflectometry (Noordwijk 2008).
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Wickert, J.; Arras, C.; Ao, C. O.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Healy, S. B.; Heise, S.; Helm, A.; Huang, C. Y.; Jakowski, N.; König, R.; Mannucci, T.; Mayer, C.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Tapley, B. (2008): Tapley CHAMP, GRACE, SAC-C, TerraSAR-X/Tandem-X, Science results, status and future prospects. ECMWF/GRAS SAF joint workshop on 'The assimilation of GPS radio-occultation (GPS RO) measurements', ECMWF (Reading, UK 2008).
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): Water vapor measurements using GPS: Recent activities at GFZ Potsdam. International PGGM-IAGOS Workshop (Taipeh 2008).
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Wickert, J.; Arras, C.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Ramatschi, M.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): GPS Atmosphere Sounding at GFZ: Overview and comparison of CHAMP data with MOZAIC. International PGGM-IAGOS Workshop (Taipeh 2008).
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Wickert, J.; Arras, C.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Heise, S.; Köhler, W.; König, R.; Michalak, G.; Ramatschi, M.; Rothacher, M.; Schmidt, T.; Stosius, R. (2008): GPS radio occultation: Recent results from GFZ. 4th Asian Space Conference (Taipeh 2008).
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Wickert, J.; Arras, C.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Heise, S.; Köhler, W.; König, R.; Michalak, G.; Ramatschi, M; Rothacher, M.; Schmidt, T.; Stosius, R. (2008): GPS radio occultation: Recent activities at GFZ. 4th Asian Space Conference & FORMOSAT-3/COSMIC International Workshop (Taipei, Taiwan 2008).
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Helm, A.; Montenbruck, O.; Ashjaee, J.; Yudanov, S.; Beyerle, G.; Stosius, R.; Rothacher, M. (2007): GORS - A GNSS Occultation, Reflectometry and Scatterometry Space Receiver. 20th International Technical Meeting of the Satellite Division of The Institute of Navigation - ION GNSS (Fort Worth, Texas, USA 2007), 2011-2021.
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Helm, A.; Stosius, R.; Beyerle, G.; Montenbruck, O.; Rothacher, M. (2007): Status of GNSS reflectometry related receiver developments and feasibility studies within the German Indonesian Tsunami Early Warning System. IEEE International Geoscience and Remote Sensing Symposium - IGARSS 2007 (Barcelona, Spain 2007), 5084-5087.
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Helm, A.; Wickert, J.; Beyerle, G.; Schmidt, T.; Heise, S.; Stosius, R.; Sobolev, S. V.; Babeyko, A. Y.; Rothacher, M.; Yudanov, S.; Ashjaee, J.; Chen, R.; Rocken, C. (2007): New GNSS Remote Sensing Opportunities with ACES. ACES IWG Meeting (Paris 2007).
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Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Coastal altimetry at the Baltic Sea off-shore Rugen using L1 carrierphase-delay observations of reflected GPS signals at low elevation angles. GNSSR’06 - Workshop on GNSS Reflections (Noordwijk, The Netherlands, 2006), 1-7.
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Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Remote monitoring of the Baltic Sea surface off-shore Rügen by ground-based observations of reflected GPS signals. 3rd General Assembly European Geosciences Union (Vienna, Austria 2006).
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Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of lake level heights by ground-based observations of reflected GPS signals. 2nd General Assembly European Geosciences Union (Vienna, Austria 2005).
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Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of ocean heights by ground-based observations of reflected GPS signals: 2 case studies. GNSS Reflection Workshop 2005 (Guildford, UK 2005).
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Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of ocean heights in coastal areas by ground-based observations of reflected GPS signal. 2nd General Assembly European Geosciences Union (Vienna, Austria 2005).
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Helm, A.; Beyerle, G.; Nitschke, M. (2004): Monitoring lake surface height changes with a ground-based GPS reflectometry receiver. 1st General Assembly European Geosciences Union (Nice, France 2004).
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Schöne, T.; Helm, A.; Braun, A.; Wen, H.; Reigber, C. (2003): An online satellite altimetry data processing system: ADS central. 23rd General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Sapporo, Japan 2003).
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Eickschen, S.; Schöne, T.; Braun, A.; Helm, A. (2001): Steps towards an improved algorithm for ocean near surface wind speeds derived from satellite radar altimeter data. AGU 2001 Fall Meeting (San Fracisco 2001).
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Oldenburg, T. B. P.; Wilkes, H.; Horsfield, B.; van Duin, A. C. T.; Stoddart, D.; Wilhelms, A. (2001): Tracing migration, water washing and biodegradation in the Tampen Spur, offshore Norway, using xanthones, carbazoles and fluorenones. 20th International Meeting on Organic Geochemistry.
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Braun, A.; Helm, A.; Rentsch, M.; Schöne, T. (2000): Meeresspiegeländerungen in Svalbard aus Altimetrie und Pegelmessungen. 60. Jahrestagung der Deutschen Geophysikalischen Gesellschaft ( DGG ) (München 2000).
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Helm, A.; Braun, A.; Rentsch, M.; Schöne, T. (2000): Bestimmung der instantanen Meereshöhe mit synthetischen Altimetrie Daten. 60. Jahrestagung der Deutschen Geophysikalischen Gesellschaft ( DGG ) (München 2000).
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Braun, A.; Helm, A.; Rentsch, M.; Schöne, T. (1999): Calibration of ERS altimetric data in the western Spitsbergen shelf through tide gauge data. EGS Vening Meinesz Conference (Loiro-Porto San Paolo, Italy 1999).
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Helm, A.; Braun, A.; Rentsch, M.; Schöne, T. (1999): Calibration of X-SAR during the Shuttle Radar Topography Mission Using Synthetic Altimeter Data. AGU 1999 Fall Meeting (San Francisco, USA 1999).
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Helm, A. (2008): Ground-based GPS altimetry with the L1 OpenGPS receiver using carrier phase-delay observations of reflected GPS signals. Scientific Technical Report ; 08/10, Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ, 163.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Chen, J.; Dick, G.; Ge, M.; Heise, S.; Helm, A.; Rothacher, M.; Ramatschi, M.; Schmidt, T.; Stosius, R. (2009): GNSS atmosphere sounding at GFZ: Overview and recent results.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Ramatschi, M.; Rothacher, M.; Schmidt, T.; Stosius, R. (2008): GNSS Atmosphere Sounding: Recent activities at GFZ Potsdam.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Ramatschi, M.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): GNSS Atmosphere Sounding: Recent activities at GFZ Potsdam.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Ramatschi, M.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): GPS Atmosphere Sounding at GFZ: Overview and recent activities.
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): GNSS Atmosphere Sounding: Recent activities at GFZ Potsdam.
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Wickert, J.; Bender, M.; Beyerle, G.; Dick, G.; Gendt, G.; Grunwaldt, L.; Heise, S.; Helm, A.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Viehweg, Ch. (2007): GNSS atmospheric sounding and reflectometry.
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Wickert, J.; Beyerle, G.; Dick, G.; Gendt, G.; Heise, S.; Helm, A.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Viehweg, Ch. (2006): Atmospheric sounding and reflectometry with GNSS.
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Wickert, J.; Beyerle, G.; Dick, G.; Gendt, G.; Heise, S.; Helm, A.; Michalak, G.; Schmidt, T.; Viehweg, C. (2006): GNSS basierte Fernerkundung: Visionen, Ideen und Fragen.
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Helm, A.; Barthelmes, F.; Beyerle, G.; Bohm, M.; Kaban, M. K.; Magnussen, S.; Reigber, C.; Schwintzer, P.; Schmidt, R.; Schmidt, T.; Schöne, T.; Wickert, J. (2005): Wie hoch sind die Wellen? - Meeres- und Wellenhöhen aus reflektierten GPS-Signalen bestimmen. Kopernikus-Gymnasium.
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Helm, A.; Barthelmes, F.; Beyerle, G.; Bohm, M.; Kaban, M. K.; Magnussen, S.; Reigber, C.; Schwintzer, P.; Schmidt, R.; Schmidt, T.; Schöne, T.; Wickert, J. (2005): Wie hoch sind die Wellen? Meer rausholen aus GPS.
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Helm, A.; Beyerle, G.; Bohm, M.; Michajljow, W.; Reigber, C.; Schwintzer, P.; Schmidt, R.; Schmidt, T.; Schöne, T.; Wetzel, H.-U.; Wickert, J. (2005): Meer rausholen aus GPS. Deutsche Meteorologische Gesellschaft (DMG) ; Geoforschungszentrum Potsdam.
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